Pham Huyen T, Nguyen Tam D, Islam Md Earul, Tran Dat Q, Akabori Masashi
Japan Advanced Institute of Science and Technology 1-1 Asahidai Nomi 923-1292 Japan
Interdisciplinary Graduate School, Nanyang Technological University Singapore.
RSC Adv. 2018 Jan 2;8(2):632-639. doi: 10.1039/c7ra11123a.
The hybrid structure of ZnO NWs with the presence of different dopants recently has drawn many interests from researchers due to the possibility to integrate multiple functionalities into one single structure. In this article, we investigated the morphology, crystal structure and ferromagnetism of the ZnO@Co/Ni hybrid core@shell NWs prepared by a facile electrochemical deposition method. The results show that a thin layer of Ni and Co coated on the surface of ZnO NWs (confirmed by XRD, EDS, TEM and Raman scattering) can create a significant improvement of ferromagnetic property in such hybrid core@shell NWs. In which, for the coating time of 10, 15, 20 min, the value of is around 0.67, 0.88 and 2.56 emu g for ZnO@Co NWs, and about 0.013, 0.022 and 0.031 emu g for ZnO@Ni NWs, respectively, in comparison with the number of 0.016 emu g for pure ZnO NWs. Interestingly, we also found the temperature dependence of ferromagnetism of such Co/Ni coated ZnO NWs. These results reveal the possibility to employ such hybrid core@shell NWs for many applications, spin field effect transistors.
近年来，具有不同掺杂剂的氧化锌纳米线（ZnO NWs）的混合结构由于能够将多种功能集成到单一结构中而引起了研究人员的广泛关注。在本文中，我们研究了通过简便的电化学沉积方法制备的ZnO@Co/Ni混合核壳纳米线的形貌、晶体结构和铁磁性。结果表明，涂覆在ZnO纳米线表面的一层薄镍和钴（通过X射线衍射、能谱、透射电子显微镜和拉曼散射证实）可使这种混合核壳纳米线的铁磁性能得到显著改善。其中，对于10、15、20分钟的涂覆时间，ZnO@Co纳米线的 值分别约为0.67、0.88和2.56 emu/g，ZnO@Ni纳米线的 值分别约为0.013、0.022和0.031 emu/g，而纯ZnO纳米线的值为0.016 emu/g。有趣的是，我们还发现了这种涂覆有Co/Ni的ZnO纳米线的铁磁性与温度的关系。这些结果揭示了将这种混合核壳纳米线用于许多应用的可能性，例如自旋场效应晶体管。
